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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [fs/] [stat.c] - Blame information for rev 1765

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Line No. Rev Author Line
1 199 simons
/*
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 *  linux/fs/stat.c
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 *
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 *  Copyright (C) 1991, 1992  Linus Torvalds
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 */
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <asm/segment.h>
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#ifndef __alpha__
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/*
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 * For backward compatibility?  Maybe this should be moved
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 * into arch/i386 instead?
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 */
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static void cp_old_stat(struct inode * inode, struct old_stat * statbuf)
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{
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        struct old_stat tmp;
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        static int nagcount = 0;
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        if (++nagcount < 5)
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                printk("VFS: Warning: %s using old stat() call. "
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                        "Recompile your binary.\n",
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                        current->comm);
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        tmp.st_dev = kdev_t_to_nr(inode->i_dev);
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        tmp.st_ino = inode->i_ino;
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        tmp.st_mode = inode->i_mode;
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        tmp.st_nlink = inode->i_nlink;
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        tmp.st_uid = inode->i_uid;
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        tmp.st_gid = inode->i_gid;
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        tmp.st_rdev = kdev_t_to_nr(inode->i_rdev);
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        tmp.st_size = inode->i_size;
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        if (inode->i_pipe)
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                tmp.st_size = PIPE_SIZE(*inode);
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        tmp.st_atime = inode->i_atime;
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        tmp.st_mtime = inode->i_mtime;
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        tmp.st_ctime = inode->i_ctime;
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        memcpy_tofs(statbuf,&tmp,sizeof(tmp));
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}
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#endif
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static void cp_new_stat(struct inode * inode, struct new_stat * statbuf)
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{
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        struct new_stat tmp;
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        unsigned int blocks, indirect;
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        memset(&tmp, 0, sizeof(tmp));
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        tmp.st_dev = kdev_t_to_nr(inode->i_dev);
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        tmp.st_ino = inode->i_ino;
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        tmp.st_mode = inode->i_mode;
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        tmp.st_nlink = inode->i_nlink;
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        tmp.st_uid = inode->i_uid;
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        tmp.st_gid = inode->i_gid;
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        tmp.st_rdev = kdev_t_to_nr(inode->i_rdev);
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        tmp.st_size = inode->i_size;
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        if (inode->i_pipe)
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                tmp.st_size = PIPE_SIZE(*inode);
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        tmp.st_atime = inode->i_atime;
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        tmp.st_mtime = inode->i_mtime;
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        tmp.st_ctime = inode->i_ctime;
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/*
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 * st_blocks and st_blksize are approximated with a simple algorithm if
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 * they aren't supported directly by the filesystem. The minix and msdos
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 * filesystems don't keep track of blocks, so they would either have to
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 * be counted explicitly (by delving into the file itself), or by using
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 * this simple algorithm to get a reasonable (although not 100% accurate)
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 * value.
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 */
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/*
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 * Use minix fs values for the number of direct and indirect blocks.  The
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 * count is now exact for the minix fs except that it counts zero blocks.
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 * Everything is in BLOCK_SIZE'd units until the assignment to
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 * tmp.st_blksize.
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 */
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#define D_B   7
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#define I_B   (BLOCK_SIZE / sizeof(unsigned short))
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        if (!inode->i_blksize) {
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                blocks = (tmp.st_size + BLOCK_SIZE - 1) / BLOCK_SIZE;
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                if (blocks > D_B) {
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                        indirect = (blocks - D_B + I_B - 1) / I_B;
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                        blocks += indirect;
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                        if (indirect > 1) {
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                                indirect = (indirect - 1 + I_B - 1) / I_B;
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                                blocks += indirect;
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                                if (indirect > 1)
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                                        blocks++;
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                        }
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                }
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                tmp.st_blocks = (BLOCK_SIZE / 512) * blocks;
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                tmp.st_blksize = BLOCK_SIZE;
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        } else {
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                tmp.st_blocks = inode->i_blocks;
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                tmp.st_blksize = inode->i_blksize;
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        }
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        memcpy_tofs(statbuf,&tmp,sizeof(tmp));
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}
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#ifndef __alpha__
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/*
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 * For backward compatibility?  Maybe this should be moved
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 * into arch/i386 instead?
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 */
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asmlinkage int sys_stat(char * filename, struct old_stat * statbuf)
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{
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        struct inode * inode;
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        int error;
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        error = verify_area(VERIFY_WRITE,statbuf,sizeof (*statbuf));
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        if (error)
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                return error;
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        error = namei(filename,&inode);
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        if (error)
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                return error;
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        cp_old_stat(inode,statbuf);
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        iput(inode);
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        return 0;
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}
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#endif
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asmlinkage int sys_newstat(char * filename, struct new_stat * statbuf)
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{
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        struct inode * inode;
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        int error;
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        error = verify_area(VERIFY_WRITE,statbuf,sizeof (*statbuf));
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        if (error)
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                return error;
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        error = namei(filename,&inode);
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        if (error)
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                return error;
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        cp_new_stat(inode,statbuf);
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        iput(inode);
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        return 0;
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}
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#ifndef __alpha__
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/*
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 * For backward compatibility?  Maybe this should be moved
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 * into arch/i386 instead?
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 */
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asmlinkage int sys_lstat(char * filename, struct old_stat * statbuf)
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{
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        struct inode * inode;
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        int error;
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        error = verify_area(VERIFY_WRITE,statbuf,sizeof (*statbuf));
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        if (error)
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                return error;
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        error = lnamei(filename,&inode);
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        if (error)
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                return error;
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        cp_old_stat(inode,statbuf);
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        iput(inode);
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        return 0;
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}
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#endif
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asmlinkage int sys_newlstat(char * filename, struct new_stat * statbuf)
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{
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        struct inode * inode;
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        int error;
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176
        error = verify_area(VERIFY_WRITE,statbuf,sizeof (*statbuf));
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        if (error)
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                return error;
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        error = lnamei(filename,&inode);
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        if (error)
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                return error;
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        cp_new_stat(inode,statbuf);
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        iput(inode);
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        return 0;
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}
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#ifndef __alpha__
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/*
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 * For backward compatibility?  Maybe this should be moved
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 * into arch/i386 instead?
192
 */
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asmlinkage int sys_fstat(unsigned int fd, struct old_stat * statbuf)
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{
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        struct file * f;
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        struct inode * inode;
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        int error;
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        error = verify_area(VERIFY_WRITE,statbuf,sizeof (*statbuf));
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        if (error)
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                return error;
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        if (fd >= NR_OPEN || !(f=current->files->fd[fd]) || !(inode=f->f_inode))
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                return -EBADF;
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        cp_old_stat(inode,statbuf);
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        return 0;
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}
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#endif
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asmlinkage int sys_newfstat(unsigned int fd, struct new_stat * statbuf)
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{
212
        struct file * f;
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        struct inode * inode;
214
        int error;
215
 
216
        error = verify_area(VERIFY_WRITE,statbuf,sizeof (*statbuf));
217
        if (error)
218
                return error;
219
        if (fd >= NR_OPEN || !(f=current->files->fd[fd]) || !(inode=f->f_inode))
220
                return -EBADF;
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        cp_new_stat(inode,statbuf);
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        return 0;
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}
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asmlinkage int sys_readlink(const char * path, char * buf, int bufsiz)
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{
227
        struct inode * inode;
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        int error;
229
 
230
        if (bufsiz <= 0)
231
                return -EINVAL;
232
        error = verify_area(VERIFY_WRITE,buf,bufsiz);
233
        if (error)
234
                return error;
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        error = lnamei(path,&inode);
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        if (error)
237
                return error;
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        if (!inode->i_op || !inode->i_op->readlink) {
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                iput(inode);
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                return -EINVAL;
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        }
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        UPDATE_ATIME(inode);
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        return inode->i_op->readlink(inode,buf,bufsiz);
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}

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